CVE-2019-1737: Cisco IOS

High severity, CVSS 8.6. EPSS: 2.6% chance of exploitation in the next 30 days.

A vulnerability in the processing of IP Service Level Agreement (SLA) packets by Cisco IOS Software and Cisco IOS XE software could allow an unauthenticated, remote attacker to cause an interface wedge and an eventual denial of service (DoS) condition on the affected device. The vulnerability is due to improper socket resources handling in the IP SLA responder application code. An attacker could exploit this vulnerability by sending crafted IP SLA packets to an affected device. An exploit could allow the attacker to cause an interface to become wedged, resulting in an eventual denial of service (DoS) condition on the affected device.

Affected products

• Cisco IOS: version 12.2(58)ex only; version 12.2(58)ez only; version 12.2(60)ez only; version 12.2(60)ez1 only; version 12.2(60)ez2 only; version 12.2(60)ez3 only; …
• Cisco IOS XE: version 3.2.0se only; version 3.2.1se only; version 3.2.2se only; version 3.2.3se only; version 3.3.0se only; version 3.3.0xo only; …

Published 2019-03-27. Last modified 2026-06-17.